Siternet

Siternet Post Deleter is a safe and controlled tool for bulk deleting WordPress posts in batches.
Instead of deleting all posts at once, the plugin allows administrators to remove posts step-by-step using a configurable batch size. This reduces the risk of server overload and accidental data loss.
Key features:
<ul>
<li>Batch-based deletion (adjustable size)</li>
<li>Optional category filtering</li>
<li>Permanent deletion (no trash)</li>
<li>Safe media cleanup</li>
<li>Featured image protection logic</li>
<li>Admin-only access with capability checks</li>
<li>Nonce-protected destructive actions</li>
</ul>
When deleting posts, the plugin also removes associated media. However, it includes a safety mechanism that prevents deletion of images still used as featured images in other posts.
This makes it suitable for content cleanup, migrations, and maintenance tasks.

Siternet Post Deleter

Short Description: Safely delete WordPress posts in batches with smart media cleanup and featured image protection.

Alan Cesarini

The Void is ideal for test sites. This plugin deletes all content in a WordPress single site. It deletes posts, pages, tags, categories, custom post types, taxonomy terms and menus. 
No filters or parameters. The Void cleans your site with just one click.

The Void

Removes all content in a WP site with just 1 click.

Siternet Post Deleter vs The Void